When does a product need a new bar code? Normally, the answer to that question is fairly straightforward. When a major new ingredient is added — the introduction of Banana Nut Cheerios, for example — the new formulation receives its own UPC bar code, including the unique 12-digit Global Trade Item Number (GTIN) encoded in the bar code. But what if the changes made to a product are more subtle? What if an item's packaging is modified for a holiday? Or a small change is made to its net ...

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